1 /* $NetBSD: ofw_irqhandler.c,v 1.6 2006/05/11 12:05:37 yamt Exp $ */ 2 3 /* 4 * Copyright (c) 1994-1998 Mark Brinicombe. 5 * Copyright (c) 1994 Brini. 6 * All rights reserved. 7 * 8 * This code is derived from software written for Brini by Mark Brinicombe 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by Mark Brinicombe 21 * for the NetBSD Project. 22 * 4. The name of the company nor the name of the author may be used to 23 * endorse or promote products derived from this software without specific 24 * prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 * 37 * from: irqhandler.c 38 * 39 * IRQ/FIQ initialisation, claim, release and handler routines 40 * 41 * Created : 30/09/94 42 */ 43 44 #include <sys/cdefs.h> 45 __KERNEL_RCSID(0, "$NetBSD: ofw_irqhandler.c,v 1.6 2006/05/11 12:05:37 yamt Exp $"); 46 47 #include "opt_irqstats.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/syslog.h> 52 #include <sys/malloc.h> 53 54 #include <uvm/uvm_extern.h> 55 56 #include <machine/intr.h> 57 #include <machine/cpu.h> 58 59 irqhandler_t *irqhandlers[NIRQS]; 60 61 int current_intr_depth; 62 u_int current_mask; 63 u_int actual_mask; 64 u_int disabled_mask; 65 u_int spl_mask; 66 u_int irqmasks[IPL_LEVELS]; 67 extern u_int intrcnt[]; 68 69 extern u_int soft_interrupts; /* Only so we can initialise it */ 70 71 extern char *_intrnames; 72 73 /* Prototypes */ 74 75 int podule_irqhandler __P((void)); 76 extern void set_spl_masks __P((void)); 77 78 /* 79 * void irq_init(void) 80 * 81 * Initialise the IRQ/FIQ sub system 82 */ 83 84 void 85 irq_init() 86 { 87 int loop; 88 89 /* Clear all the IRQ handlers and the irq block masks */ 90 for (loop = 0; loop < NIRQS; ++loop) { 91 irqhandlers[loop] = NULL; 92 } 93 94 /* 95 * Setup the irqmasks for the different Interrupt Priority Levels 96 * We will start with no bits set and these will be updated as handlers 97 * are installed at different IPL's. 98 */ 99 for (loop = 0; loop < IPL_LEVELS; ++loop) 100 irqmasks[loop] = 0; 101 102 current_intr_depth = 0; 103 current_mask = 0x00000000; 104 disabled_mask = 0x00000000; 105 actual_mask = 0x00000000; 106 spl_mask = 0x00000000; 107 soft_interrupts = 0x00000000; 108 109 set_spl_masks(); 110 111 /* Enable IRQ's and FIQ's */ 112 enable_interrupts(I32_bit | F32_bit); 113 } 114 115 116 /* 117 * int irq_claim(int irq, irqhandler_t *handler) 118 * 119 * Enable an IRQ and install a handler for it. 120 */ 121 122 int 123 irq_claim(irq, handler) 124 int irq; 125 irqhandler_t *handler; 126 { 127 int level; 128 int loop; 129 130 #ifdef DIAGNOSTIC 131 /* Sanity check */ 132 if (handler == NULL) 133 panic("NULL interrupt handler"); 134 if (handler->ih_func == NULL) 135 panic("Interrupt handler does not have a function"); 136 #endif /* DIAGNOSTIC */ 137 138 /* 139 * IRQ_INSTRUCT indicates that we should get the irq number 140 * from the irq structure 141 */ 142 if (irq == IRQ_INSTRUCT) 143 irq = handler->ih_num; 144 145 /* Make sure the irq number is valid */ 146 if (irq < 0 || irq >= NIRQS) 147 return(-1); 148 149 /* Make sure the level is valid */ 150 if (handler->ih_level < 0 || handler->ih_level >= IPL_LEVELS) 151 return(-1); 152 153 /* Attach handler at top of chain */ 154 handler->ih_next = irqhandlers[irq]; 155 irqhandlers[irq] = handler; 156 157 /* 158 * Reset the flags for this handler. 159 * As the handler is now in the chain mark it as active. 160 */ 161 handler->ih_flags = 0 | IRQ_FLAG_ACTIVE; 162 163 /* 164 * Record the interrupt number for accounting. 165 * Done here as the accounting number may not be the same as the 166 * IRQ number though for the moment they are 167 */ 168 handler->ih_num = irq; 169 170 #ifdef IRQSTATS 171 /* Get the interrupt name from the head of the list */ 172 if (handler->ih_name) { 173 char *ptr = _intrnames + (irq * 14); 174 strcpy(ptr, " "); 175 strncpy(ptr, handler->ih_name, 176 min(strlen(handler->ih_name), 13)); 177 } else { 178 char *ptr = _intrnames + (irq * 14); 179 sprintf(ptr, "irq %2d ", irq); 180 } 181 #endif /* IRQSTATS */ 182 183 /* 184 * Update the irq masks. 185 * Find the lowest interrupt priority on the irq chain. 186 * Interrupt is allowable at priorities lower than this. 187 * If ih_level is out of range then don't bother to update 188 * the masks. 189 */ 190 if (handler->ih_level >= 0 && handler->ih_level < IPL_LEVELS) { 191 irqhandler_t *ptr; 192 193 /* 194 * Find the lowest interrupt priority on the irq chain. 195 * Interrupt is allowable at priorities lower than this. 196 */ 197 ptr = irqhandlers[irq]; 198 if (ptr) { 199 level = ptr->ih_level - 1; 200 while (ptr) { 201 if (ptr->ih_level - 1 < level) 202 level = ptr->ih_level - 1; 203 ptr = ptr->ih_next; 204 } 205 while (level >= 0) { 206 irqmasks[level] |= (1 << irq); 207 --level; 208 } 209 } 210 211 #include "sl.h" 212 #include "ppp.h" 213 #if NSL > 0 || NPPP > 0 214 /* In the presence of SLIP or PPP, splimp > spltty. */ 215 irqmasks[IPL_NET] &= irqmasks[IPL_TTY]; 216 #endif 217 } 218 219 enable_irq(irq); 220 set_spl_masks(); 221 222 return(0); 223 } 224 225 226 /* 227 * int irq_release(int irq, irqhandler_t *handler) 228 * 229 * Disable an IRQ and remove a handler for it. 230 */ 231 232 int 233 irq_release(irq, handler) 234 int irq; 235 irqhandler_t *handler; 236 { 237 int level; 238 int loop; 239 irqhandler_t *irqhand; 240 irqhandler_t **prehand; 241 extern char *_intrnames; 242 243 /* 244 * IRQ_INSTRUCT indicates that we should get the irq number 245 * from the irq structure 246 */ 247 if (irq == IRQ_INSTRUCT) 248 irq = handler->ih_num; 249 250 /* Make sure the irq number is valid */ 251 if (irq < 0 || irq >= NIRQS) 252 return(-1); 253 254 /* Locate the handler */ 255 irqhand = irqhandlers[irq]; 256 prehand = &irqhandlers[irq]; 257 258 while (irqhand && handler != irqhand) { 259 prehand = &irqhand; 260 irqhand = irqhand->ih_next; 261 } 262 263 /* Remove the handler if located */ 264 if (irqhand) 265 *prehand = irqhand->ih_next; 266 else 267 return(-1); 268 269 /* Now the handler has been removed from the chain mark is as inactive */ 270 irqhand->ih_flags &= ~IRQ_FLAG_ACTIVE; 271 272 /* Make sure the head of the handler list is active */ 273 if (irqhandlers[irq]) 274 irqhandlers[irq]->ih_flags |= IRQ_FLAG_ACTIVE; 275 276 #ifdef IRQSTATS 277 /* Get the interrupt name from the head of the list */ 278 if (irqhandlers[irq] && irqhandlers[irq]->ih_name) { 279 char *ptr = _intrnames + (irq * 14); 280 strcpy(ptr, " "); 281 strncpy(ptr, irqhandlers[irq]->ih_name, 282 min(strlen(irqhandlers[irq]->ih_name), 13)); 283 } else { 284 char *ptr = _intrnames + (irq * 14); 285 sprintf(ptr, "irq %2d ", irq); 286 } 287 #endif /* IRQSTATS */ 288 289 /* 290 * Update the irq masks. 291 * If ih_level is out of range then don't bother to update 292 * the masks. 293 */ 294 if (handler->ih_level >= 0 && handler->ih_level < IPL_LEVELS) { 295 irqhandler_t *ptr; 296 297 /* Clean the bit from all the masks */ 298 for (level = 0; level < IPL_LEVELS; ++level) 299 irqmasks[level] &= ~(1 << irq); 300 301 /* 302 * Find the lowest interrupt priority on the irq chain. 303 * Interrupt is allowable at priorities lower than this. 304 */ 305 ptr = irqhandlers[irq]; 306 if (ptr) { 307 level = ptr->ih_level - 1; 308 while (ptr) { 309 if (ptr->ih_level - 1 < level) 310 level = ptr->ih_level - 1; 311 ptr = ptr->ih_next; 312 } 313 while (level >= 0) { 314 irqmasks[level] |= (1 << irq); 315 --level; 316 } 317 } 318 } 319 320 /* 321 * Disable the appropriate mask bit if there are no handlers left for 322 * this IRQ. 323 */ 324 if (irqhandlers[irq] == NULL) 325 disable_irq(irq); 326 327 set_spl_masks(); 328 329 return(0); 330 } 331 332 333 void * 334 intr_claim(irq, level, name, ih_func, ih_arg) 335 int irq; 336 int level; 337 const char *name; 338 int (*ih_func) __P((void *)); 339 void *ih_arg; 340 { 341 irqhandler_t *ih; 342 343 ih = malloc(sizeof(*ih), M_DEVBUF, M_NOWAIT); 344 if (!ih) 345 panic("intr_claim(): Cannot malloc handler memory"); 346 347 ih->ih_level = level; 348 ih->ih_name = name; 349 ih->ih_func = ih_func; 350 ih->ih_arg = ih_arg; 351 ih->ih_flags = 0; 352 353 if (irq_claim(irq, ih) != 0) 354 return(NULL); 355 return(ih); 356 } 357 358 359 int 360 intr_release(arg) 361 void *arg; 362 { 363 irqhandler_t *ih = (irqhandler_t *)arg; 364 365 if (irq_release(ih->ih_num, ih) == 0) { 366 free(ih, M_DEVBUF); 367 return(0); 368 } 369 return(1); 370 } 371 372 373 /* 374 * void disable_irq(int irq) 375 * 376 * Disables a specific irq. The irq is removed from the master irq mask 377 */ 378 379 void 380 disable_irq(irq) 381 int irq; 382 { 383 register int oldirqstate; 384 385 oldirqstate = disable_interrupts(I32_bit); 386 current_mask &= ~(1 << irq); 387 irq_setmasks(); 388 restore_interrupts(oldirqstate); 389 } 390 391 392 /* 393 * void enable_irq(int irq) 394 * 395 * Enables a specific irq. The irq is added to the master irq mask 396 * This routine should be used with caution. A handler should already 397 * be installed. 398 */ 399 400 void 401 enable_irq(irq) 402 int irq; 403 { 404 register u_int oldirqstate; 405 406 oldirqstate = disable_interrupts(I32_bit); 407 current_mask |= (1 << irq); 408 irq_setmasks(); 409 restore_interrupts(oldirqstate); 410 } 411 412 413 /* 414 * void stray_irqhandler(u_int mask) 415 * 416 * Handler for stray interrupts. This gets called if a handler cannot be 417 * found for an interrupt. 418 */ 419 420 void stray_irqhandler(u_int); /* called from assembly */ 421 422 void 423 stray_irqhandler(mask) 424 u_int mask; 425 { 426 static u_int stray_irqs = 0; 427 428 if (++stray_irqs <= 8) 429 log(LOG_ERR, "Stray interrupt %08x%s\n", mask, 430 stray_irqs >= 8 ? ": stopped logging" : ""); 431 } 432